* Add support for the React `useEffect` hook
* Format
* Format
* [Refactor] remove unnecessary condition
`canHaveTrailingComma` is defined as `I(lastElem && ...)`, which will always be true when `lastElem === null`.
* Use a hacky method to allow the array to break
* Revert "[Refactor] remove unnecessary condition"
This reverts commit 91906ba22438afa0fe5e10c64a1fcf3cfa484ff3.
* Add tests for `React.useEffect` form
Jed Fox